共查询到20条相似文献，搜索用时 158 毫秒
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据2003年山地农业开发水土流失调查，永春县现有荼果园、旱地水土流失面积11740．9hm^2，占地类面积的60．64％，占全县水土流失面积47．6％。严重的水土流失致使农业生态环境恶化，生态景观遭受破坏，经济发展受到制约。本就该县山地农业开发水土流失现状进行分析并提出相应防治对策。 相似文献
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豆科牧草圆叶决明在闽江下游两岸红壤山地橄榄园的应用初探 总被引：2，自引：0，他引：2
在闽江下游两岸红壤山地橄榄园进行套种豆科牧草圆叶决明试验,经多年定点观察,在红壤橄榄园套种牧草圆叶决明,能迅速覆盖幼龄果园,提高果园土壤肥力;减少建园前期水土流失,增加局部土壤水分含量,改善果树生长环境;提高果园产量,增加果园效益。 相似文献
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分析了冀西北山地水土流失的现状与原因,认为造成其水土流失的根本原因是脆弱生态因子导致山地生态系统的退化.而退化生态系统的恢复应依靠含有人工投入的生态重建方式.提出治理冀西北山地水土流失的有效生态重建途径是植被建设体系、径流调节体系、经济开发体系和社会行为体系. 相似文献
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中国西南山地型城市水土流失及其防治措施研究 总被引：1，自引：0，他引：1
分析了重庆都市区为代表的西南山地城市水土流失的现状和影响水土流失产生的自然和人文因素,并针对重庆都市区山地城市水土流失较平原城市来说自然因素影响大,危害严重,复杂的特点,提出了水土流失的预防与治理的对策。 相似文献
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丘陵山地果茶园水土资源的保护与合理利用—以建瓯市丘陵红壤果园为例 总被引：1，自引：0，他引：1
本概述建瓯市丘陵山地红壤果，茶园水土流失现状，存在问题及产生灾害后果，提出合理开发利用果茶园水土资源的战略措施。 相似文献
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小赤田小流域是昌宁县坡耕地水土流失综合治理试点工程实施项目区,土地总面积4.84 km~2,其中坡耕地面积4.39 km~2,地形主要以山地为主,为低中山山地地貌单元。结合昌宁县坡耕地水土流失综合治理试点工程,主要对试验区土壤理化性状进行分析评价,通过土壤肥力因素和土壤污染情况对试验区土壤进行综合评价,得出该小流域目前土壤肥力、土壤有机质现状及其对水土流失的影响,提出土壤质地、土壤结构的改善是水土流失综合治理的重要方向之一。 相似文献
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山地森林的水土保持作用 总被引：2，自引：0，他引：2
本论述了闽北山地水土流失的潜在危险，阐明了山地森林对水的调节和土壤保持作用，指出保护山地森林、合理调整森林结构、布置水土保持林和水源涵养林，对控制闽北的水土流失具有重要意义。 相似文献
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Suyundukov Ya. T. Suyundukova M. B. Bezuglova O. S. Khabirov I. K. Khasanova R. F. Semenova I. N. Rafikova Yu. S. Ilbulova G. R. 《Eurasian Soil Science》2022,55(1):27-35
Eurasian Soil Science - The results of the study of the properties of urban soils of the city of Sibay located in the mining region of the Republic of Bashkortostan are presented. A specific... 相似文献
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Kholodov V. A. Farkhodov Y. R. Yaroslavtseva N. V. Ziganshina A. R. Maksimovich S. V. 《Eurasian Soil Science》2022,55(7):998-1004
Eurasian Soil Science - Layers were step-by-step removed from macroaggregates (2–1 mm in diameter) of Protocalcic Chernozems via successive abrasion in a revolving rotator during 5, 10, 15,... 相似文献
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《Communications in Soil Science and Plant Analysis》2012,43(15-16):1631-1646
Abstract Brazil has approximately 30 million hectares of lowland areas, known locally as “Varzea,”; distributed throughout the country. Soils in these areas have the potential to support agricultural production, but very little is known about their fertility. The current experiment was undertaken to characterize the chemical and physical properties of representative “Varzea”; soils collected at 0–20, 20–40, 40–60, and 60–80 cm depth intervals from 23 sites in Goias State of Brazil. Organic matter contents averaged 42 g/kg in the surface 20 cm of soil and should make a significant contribution to overall nutrient availability. Soil pH increased slightly with depth from a mean value of 5.2 in the surface 20 cm of soil to a mean value of 5.4 in the 60–80 cm depth interval. Several soils had exchangeable Al values ≥ 1.0 cmol Al/kg, but soil Al saturation was generally less than the 60% level frequently associated with Al toxicity. However, cereal and legume production could benefit from lime addition in many of these soils. Although base saturation was fairly low in some soils, exchangeable Ca and Mg levels were, in general, adequate throughout the profile. Extractable P levels were adequate in most surface soil samples. Extractable K levels in these soils were generally low, and the application of K fertilizers should be beneficial, especially in conjunction with lime addition. The high clay content “Varzea”; soils of the Brazilian lowlands have some drainage problems but generally exhibit favorable chemical properties for crop production when compared to soils of the well‐drained Cerrados. 相似文献
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Ye. V. Rogozhina N. V. Kostina L. S. Malyukova 《Moscow University Soil Science Bulletin》2011,66(1):32-35
An estimation of potential nitrogen-fixing activity of various soil types under agrophytocenoses of tea, filbert, peach, and
pawpaw which grow in the area of Greater Sochi is given. High indicators of nitrogen fixation activity in the soil in the
course of vegetation were characteristic of agrocenoses of pawpaw, peach, and filbert. The lowest level of nitrogen fixation
was noted in the soil of a tea plantation. A negative correlation dependence of potential nitrogen-fixing activity on the
acidity of the soil solution was established. A study of the seasonal dynamics of the activity of nitrogen fixation of soils
of agrocenoses of the subtropical zone of Russia made it possible to distinguish a less active winter and more active spring-summer-autumn
periods. 相似文献
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The rate of popping of popcorn was measured in oil and in air. Kinetic data for lifetimes of individual kernels from a large population were obtained in oil at six constant temperatures (180–250°C) and also in an air‐popper at 202°C. The data are characterized by an induction period, which is, significantly, followed by a first‐order decrease in the number of unpopped kernels versus time. The activation energy for the first order process is 166.7 kJ/mol between 180 and 210°C, and 53.8 kJ/mol between 210 and 250°C. These data are consistent with a model that assumes 1) that the rate of heat transfer into a kernel follows Newton's law of cooling; 2) that in a sample of kernels there exists a distribution of critical pressures; 3) that for an individual kernel, the probability of popping is directly proportional to the difference between the internal aqueous vapor pressure and the kernel's critical pressure; and 4) that the measured rate constant at any temperature is an average overall of the kernels in the sample with critical pressures equal to or less than the internal aqueous vapor pressure. Minimum popping temperatures predicted by the model are 181 ± 2°C (oil) and 187 ± 2°C (air), in good agreement with previously reported direct measurements. 相似文献
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物联网是一个集信息通信、数据交换、传感器技术与软件工程于一体的综合性产业,探讨和分析了物联网的结构体系与发展中遇到的安全问题。 相似文献
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荔枝种子从果实中剥离出来后, 即使在室内条件下, 也极易失水干缩, 潮湿环境中又易发霉而腐烂。扫描电镜观察表明: 种皮上布满纹孔, 水分散失面积很大; 种脐部为疏松的海绵组织, 且营养丰富。据此, 生产上应对种子彻底清洗, 并保存于适当湿度的环境中, 以提高其发芽率。 相似文献